【iOS】让数据模型实现自动序列化

客官°小女子只卖身不卖艺 2022-10-02 14:55 107阅读 0赞

使用过一段时间后，发现当模型改动，版本升级时不太方便。

前段时间因为写了段自动序列化的代码，分记录下：  
原理就是一个根类通过条件反射实现所有数据成员的序列化，其它数据模型继承自它即可

解码实现

-(id)initWithCoder:(NSCoder *)aDecoder
    {
    self = [super init];
    
    if (self) {
    
    id tempClass = [self class];
    
    while (tempClass != [NSObject class]) {
    unsigned int outCount;
    Ivar * ivars = class_copyIvarList(tempClass, &outCount);
    
    for (int i = 0; i < outCount; i++) { //ivars如果是NULL outCount = 0,这里就判断了
    const char * typeEncode = ivar_getTypeEncoding(ivars[i]); //变量的类型
    void * data = (char *)self + ivar_getOffset(ivars[i]); //变量的内存地址
    NSString * name = [NSString stringWithUTF8String:ivar_getName(ivars[i])];//key值
    if ([self isSaveToDriver:name]) {
    
    switch (typeEncode[0]) {
    case ‘i’:
    case ‘I’://整型跟无符号整型
    *(int *)data = [aDecoder decodeIntForKey:name];
    break;
    case ‘B’://bool型
    *(BOOL *)data = [aDecoder decodeBoolForKey:name];
    break;
    case ‘c’://字符型
    *(char *)data = *[aDecoder decodeBytesForKey:name returnedLength:NULL];
    break;
    case ‘f’://float
    *(float *)data = [aDecoder decodeFloatForKey:name];
    break;
    case ‘d’://double
    *(double *)data = [aDecoder decodeDoubleForKey:name];
    break;
    case ‘@’://object
    *(id *)data = [[aDecoder decodeObjectForKey:name] retain];
    break;
    case ‘{‘://结构体
    {
    NSUInteger sizep;
    const unsigned char * _data = [aDecoder decodeBytesForKey:name returnedLength:&sizep];
    memcpy(data, _data, sizep);
    }
    break;
    
    default:
    @throw[NSException exceptionWithName:@"编码异常" reason:[NSString stringWithFormat:@"有一个对象没有实例化,对象类型%s,所在类%@,变量名%@",typeEncode,NSStringFromClass(tempClass),name] userInfo:nil];
    
    break;
    }
    }
    // NSLog(@"ivar name = %s type = %s",ivar_getName(ivars[i]),ivar_getTypeEncoding(ivars[i]));
    }
    tempClass = [tempClass superclass];
    free(ivars);//释放ivarlist
    }
    
    }
    
    return self;
    }
    [/cpp]
    
    编码实现
    [cpp]
    -(void)encodeWithCoder:(NSCoder *)aCoder
    {
    
    id tempClass = [self class];
    
    while (tempClass != [NSObject class]) {
    unsigned int outCount;
    Ivar * ivars = class_copyIvarList(tempClass, &outCount);
    
    #undef NSLog
    for (int i = 0; i < outCount; i++) {
    const char * typeEncode = ivar_getTypeEncoding(ivars[i]); //变量类型
    void * data = (char *)self + ivar_getOffset(ivars[i]); //变量地址
    NSString * name = [NSString stringWithUTF8String:ivar_getName(ivars[i])];//变量名字 key
    if ([self isSaveToDriver:name]) {
    
    switch (typeEncode[0]) {
    case ‘i’:
    case ‘I’://整型跟无符号整型
    
    [aCoder encodeInt:*(int *)data forKey:name];
    break;
    case ‘B’:
    NSLog(@"%x",(int)data);
    [aCoder encodeBool:*(BOOL *)data forKey:name];
    break;
    case ‘c’://字符型
    [aCoder encodeBytes:data length:1 forKey:name];
    break;
    case ‘f’://float
    [aCoder encodeFloat:*(float *)data forKey:name];
    break;
    case ‘d’://double
    [aCoder encodeDouble:*(double *)data forKey:name];
    break;
    case ‘@’://object
    [aCoder encodeObject:*(NSObject **)data forKey:name];
    break;
    case ‘{‘://结构体
    {
    NSUInteger sizep = 0;
    NSUInteger alignment = 0;
    NSGetSizeAndAlignment(typeEncode, &sizep, &alignment);
    [aCoder encodeBytes:data length:sizep forKey:name];
    }
    break;
    default:
    {
    @throw[NSException exceptionWithName:@"编码异常" reason:[NSString stringWithFormat:@"有一个对象没有编码,对象类型%s,所在类%@,变量名%@",typeEncode,
    NSStringFromClass(tempClass),name] userInfo:nil]
    ;
    }
    break;
    }
    }
    }
    tempClass = [tempClass superclass];
    free(ivars);
    
    }
    
    }

把这两个函数复制到根类即可实现自动序列化

源博客地址,http://onlywish.me

转载于:https://www.cnblogs.com/onlywish/p/4189015.html